 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.views.navigator;

 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.swt.dnd.TransferData;

 /**
  * A LocalSelectionTransfer may be used for drag and drop operations within the
  * same instance of Eclipse. The selection is made available directly for use in
  * the DropTargetListener. dropAccept method. The DropTargetEvent passed to
  * dropAccept does not contain the drop data. The selection may be used for
  * validation purposes so that the drop can be aborted if appropriate. This
  * class is not intended to be subclassed.
  *
  * @since 2.1
  */
 public class LocalSelectionTransfer extends
         org.eclipse.jface.util.LocalSelectionTransfer {

     private static final LocalSelectionTransfer INSTANCE = new LocalSelectionTransfer();

     /**
      * The get/set methods delegate to JFace's LocalSelectionTransfer to allow
      * data to be exchanged freely whether the client uses this
      * LocalSelectionTransfer or JFace's LocalSelectionTransfer. Protected
      * methods such as getTypeIds() are handled via inheritance, not delegation
      * due to visibility constraints.
      */
     private org.eclipse.jface.util.LocalSelectionTransfer jfaceTransfer = org.eclipse.jface.util.LocalSelectionTransfer
             .getTransfer();

     /**
      * Only the singleton instance of this class may be used.
      */
     private LocalSelectionTransfer() {
     }

     /**
      * Returns the singleton.
      *
      * @return the singleton
      */
     public static LocalSelectionTransfer getInstance() {
         return INSTANCE;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.util.LocalSelectionTransfer#getSelection()
      */
     public ISelection getSelection() {
         return jfaceTransfer.getSelection();
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.util.LocalSelectionTransfer#getSelectionSetTime()
      */
     public long getSelectionSetTime() {
         return jfaceTransfer.getSelectionSetTime();
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.util.LocalSelectionTransfer#setSelection(org.eclipse.jface.viewers.ISelection)
      */
     public void setSelection(ISelection s) {
         jfaceTransfer.setSelection(s);
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.util.LocalSelectionTransfer#setSelectionSetTime(long)
      */
     public void setSelectionSetTime(long time) {
         jfaceTransfer.setSelectionSetTime(time);
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.jface.util.LocalSelectionTransfer#javaToNative(java.lang.Object, org.eclipse.swt.dnd.TransferData)
      */
     public void javaToNative(Object object, TransferData transferData) {
         jfaceTransfer.javaToNative(object, transferData);
     }

     /* (non-Javadoc)
      * @see org.eclipse.jface.util.LocalSelectionTransfer#nativeToJava(org.eclipse.swt.dnd.TransferData)
      */
     public Object nativeToJava(TransferData transferData) {
         return jfaceTransfer.nativeToJava(transferData);
     }
 }

